OpenRP: A Guest Lecture
There was someone unfamiliar at your school (whether it was a modern school or a fantasy kind) and the curriculum he taught was for this entire month with the promise of extra credit.
"If there were other worlds out there, it would require not just time and space. Think of them like X and Y Coordinates. The third dimension, or the z coordinate, is an unknown factor but it is present regardless. It has no name, yet we see it assure every timeline and every universe exists simultaneously and are connected in a way."